code: def __enter__(self):
      self.tracker_generator = self.tracker.imagestream_predict(
          self.output_dir,
          data_type="mot",
          model_type="FairMOT",
          visualization=self.visualization,
          draw_threshold=self.draw_threshold,
      )
      next(self.tracker_generator)
  
imports: import argparse
  import glob
  import os
  import signal
  import sys
  import cv2
  import paddle
  from ppdet.core.workspace import load_config
  from ppdet.core.workspace import merge_config
  from ppdet.engine import Tracker
  from ppdet.utils.check import check_config
  from ppdet.utils.check import check_gpu
  from ppdet.utils.check import check_version
  from ppdet.utils.logger import setup_logger
  import paddlehub
  from .tracker import StreamTracker
  from paddlehub.module.module import moduleinfo
  from paddlehub.module.module import runnable
label_desc: Use image node_id 4 for calling the FairmotTracker_1088x608 obj's underlying member method code with example usage: obj.__enter__() without return types